I will add this from experience:
Once you are ready to dispose of your electrolyte, adding a bit of citric acid to the elyte, stirring and allowing it to sit for about an hour will make that brown particulate disappear and you will be left with a clear solution.
Citric acid is known to have the capability of changing CrVI into CrIII according to scientific studies. Understand that this is all relative to the amount of CrVI and rust in the solution though.
I tried this on a 1 gallon jug of electrolyte that had quite a bit of red/brown particulate from electrolysis in the bottom. Added citric acid, closed and shook the container then allowed to sit for 30 minutes.
Before citric acid, the water was yellowish with plenty of particulate.
After, the water was crystal clear with zero particulate.